clear all 
clc
x=[82.45 86.21 83.58 79.69 75.29 80.73 72.75 82.35]';
y=[83.56 64.27 73.34 74.37 79.77 67.12 77.27 78.07 72.62]';
a=0.05;
[h,sig,ci]=ttest2(x,y,a,1)
